[Ains.]

Bet his on anti-biotics and all sorts, even pressure down as low as 100 psi can blow dirt through your skin and into your bloodstream. Instant blood poisoning.
Lance end pressure on even a medium sized pressure washer can be as high as 3000psi.
Nasty stuff, in fact I've banned 'em on this boat coz people do exactly what your boss did or worse use 'em as water cannons on each other.
Just as well it wasn't a steam cleaning set to boot.

Ains.